• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (22): 38-44.doi: 10.3901/JME.2016.22.038

• 材料科学与工程 • 上一篇    下一篇

B4C/6061Al复合材料焊接接头组织与
力学性能研究*

李宇力, 王文先, 陈洪胜, 武翘楚, 赵骏超   

  1. 太原理工大学材料科学与工程学院 太原 030024
  • 出版日期:2016-11-15 发布日期:2016-11-15
  • 作者简介:

    李宇力,男,1987年出生,博士研究生。主要研究方向为金属基复合材料。

    E-mail:15503511186@163.com

    王文先(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为材料的连接及其界面行为。

    E-mail:wwx960@126.com

  • 基金资助:
    * 山西省科技攻关(20130321024)和山西省教育厅高校技术开发(20120008)资助项目; 20160202收到初稿,20160705收到修改稿;

Microstructure and Mechanical Properties of B4C/6061Al Composites Welded Joints

LI Yuli, WANG Wenxian, CHEN Hongsheng, WU Qiaochu, ZHAO Junchao   

  1. Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024
  • Online:2016-11-15 Published:2016-11-15

摘要:

基于碳化硼中10B同位素优良的热中子吸收能力,铝基碳化硼复合材作为中子吸收材料越来越多的应用于核电站中。但碳化硼颗粒的加入使该材料的可焊性变差,因此研究其焊接行为变得十分必要。采用钨极氩弧焊(Tungsten inert gas,TIG)和搅拌摩擦焊(Friction stir welding,FSW)对体积分数为30%的B4C/6061Al复合材料进行焊接,研究不同焊接方法、焊缝填充材料对复合材料对接接头微观组织及力学性能的影响。B4C/6061Al复合材料焊接接头拉伸性能如下:FSW焊>TIG焊(Al-Si焊丝)>TIG焊(6061Al焊丝)>TIG焊(6061Al-Mg焊丝)>TIG焊(无填充)。TIG焊缝区容易产生气孔、B4C颗粒分布不均匀及有害生成相是导致其力学性能不佳的主要原因。FSW可以有效避免基体金属与增强相的高温化学反应,使得焊缝区的晶粒细化,增强相颗粒的分布比TIG焊均匀,为30%B4C/6061Al复合材料最佳焊接方法,其接头的室温拉伸强度达247 MPa,为母材强度的85%。

关键词: 焊接接头, 力学性能, 微观组织, B4C/6061Al复合材料

Abstract:

Due to the special thermal neutron capturing ability of the10B isotope, B4C/Al metal matrix composites (MMCs) have become increasingly used as neutron absorber materials in the nuclear industry. However, the addition of B4C particles deteriorates the weldability of B4C/Al MMCs, thus it is necessary to investigate the welding behavior of this composite. The microstructure and mechanical properties of welded joints of 30vol.%B4C/6061Al composites are investigated by using tungsten inert gas (TIG) welding and friction stir welding (FSW). The results of the tensile strength are shown as follows:FSW>TIG welding(Al-Si filler metal)>TIG welding(6061Al filler metal)>TIG welding(6061Al-Mg filler metal)>TIG welding(no fill metal). The reasons for the poor mechanical properties of TIG welding are mainly attribute to the generation of defects (such as pores, unevenly distribution of B4C particles and harmful phase) in welding. The FSW is identified as optimum welding method for B4C/6061Al composites, which can avoid the high temperature chemical reaction between the matrix metal and reinforcing particles, and producing fine recrystallized grains in the Al matrix, and the B4C particles are uniformly distributed in the weld joints. The tensile strength of the FSW joint is about 247 MPa, which is 85% of the base material.

Key words: mechanical properties, microstructure, welded joints, B4C/6061Al composite